Undertale Random Encounter Rates

First three rooms after long hallway:
    Froggit    50.00%
    Whimsun    50.00%

First three rooms after long hallway (hard mode):
    Final Froggit				33.33%
    Final Froggit Whimsalot		33.33%
    Final Froggit Astigmatism	33.33%

Room before three rock room:
    Froggit    			25.00%
    Whimsun    			25.00%
    Moldsmal    		25.00%
    Froggit Whimsun    	15.00%
    Froggit x2    		10.00%

Three rock room:
    Froggit Whimsun    	25.00%
    Moldsmal			25.00%
    Moldsmal x3    		25.00%
    Froggit x2    		15.00%
    Moldsmal x2    		10.00%

Room before three rock room, three rock room (hard mode):
    Final Froggit Whimsalot	25.00%
    Final Froggit			25.00%
    Moldessa x2				25.00%
    Parsnik					15.00%
    Moldessa x3				10.00%

Four frogs room, Perspective room 1:
    Vegetoid    		13.33%
    Moldsmal Migosp    	46.67%
    Loox    			40.00%

Six hole room:
    Vegetoid    		13.33%
    Moldsmal Migosp    	46.67%
    Loox    			40.00%

Perspective rooms 2, 3, and 4:
    Moldsmal Migosp    		20.00%
    Migosp Vegetoid    		20.00%
    Loox    				20.00%
    Vegetoid x2    			20.00%
    Loox x2    				15.00%
    Loox Vegetoid Migosp   	5.00%

Four frogs room, six hole room, all perspective rooms (hard mode):
    Moldessa Migospel		20.00%
    Parsnik Migospel		20.00%
    Parsnik x2				20.00%
    Final Froggit Migospel	20.00%
    Moldessa x3				15.00%
    Astigmatism x2			5.00%

Box Road, Papyrus's sentry station, ice patch:
    Snowdrake/Chilldrake	53.33%
    Icecap    				46.67%

Dog marriage, Precarious bridge:
    Icecap Jerry    					56.67%
    Icecap Jerry Snowdrake/Chilldrake  	43.33%

Gyftrot room:
    Gyftrot    100.00%

Glyde room:
    Glyde    100.00%

Flower puzzle, wishing room, glowing water room:
    Woshua    		26.67%
    Moldsmal x2    	26.67%
    Aaron    		20.00%
    Woshua Aaron   	26.67%

Three rooms after Gerson's shop:
    Woshua Aaron    	33.33%
    Woshua Moldbygg    	40.00%
    Temmie    			26.67%

All Hotland encounters outside Core:
    Tsunderplane    		33.33%
    Pyrope x2    			26.67%
    Tsunderplane Vulkin    	40.00%

All Core encounters:
    Final Froggit Astigmatism    			13.33%
    Whimsalot Final Froggit    				20.00%
    Whimsalot Astigmatism    				20.00%
    Knight Knight Madjick    				20.00%
    Final Froggit Astigmatism Whimsalot    	13.33%
    Knight Knight    						6.67%
    Madjick    								6.67%